Try Priscian, Institutiones Grammaticae, Book 1 and more if you like it, and see what you think, I say. Everyone should read it so why not now or soon. I class it as a post-modern mix of thriller and detective story.

You surely have lots of books on many things, Quis ut Deus. I think you might be missing the point about Priscian. I'm not recommending it be read merely as a grammar book but because the reading of this famous Latin grammar book is useful in itself, since, unless I'm mistaken, your other grammar books won't be in Latin, nor were they compulsory reading for so many generations for over a millenium. It's a seminal work and one I personally as a learner love to read. But if it doesn't appeal, no problem!